Pobtable cylinder gbinber



I. L. GAIINER.

PORTABLE CYLINDER GRINDER. APPLICATION FILED sIzPIJ. 1919.

5/ duhrI L arn'er.

1. L. GARNER. PORTABLE-CYLINDER G'mNDER.

APPLICATION FILED SEPT. B|1919.

f the like.

ATENT FFECE.

JOHN L, GARNER, OF MILAUKEE, W'ISCONSIN.

PORTABLE CYLSL'NDER GERNER.

inname.

Application filed September To (all whom t may conce/Mi.: Y

Be it known that l, JOHN L. Gamma, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented certain new and useful Improvements in Portable Cylinder Grinders,and l do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to new and useful improvements in grinders of a portable type adapted primarily for removing the surplus material from the inner walls of cylinders and similar tubular articles, but it relates particularly to machines for finishing the walls of the cylinders of internal combustion engines.

One of the important objects of the invention is to provide an improved arrangement whereby the normally high rotative speed of the electric motor or other driving unit may be stepped down so that the movement of the grinder wheel into and out of the cylinder will be relatively slow, thereby obviating the possibility of scoring the cylinder walls. In carrying out thisA object of the invention, the machine includes two threadedly engaged members, both of which are rotated in the same direction, but at different speeds, for instance when the member which carries the grinder wheel is rotated at a greater speed than the other or fixed member, it will be moved in a direction longitudinally of its axis to shift the .grinder into a cylinder or On the other hand when the fixed member is rotated at a greater speed than the other member, the latter will be moved outwardly or out of the cylinder.

lilith this and other objects in view, the invention consists in the novel features of construction, combination and arrangement of parts which will be hereinafter more particularly described and claimed.

Referring to the drawings in which similar reference charactersdesignate like parts throughout the several views, Figure 1 represents a vertical sectional view taken sub stantially on the plane of the line 1-.-1 of Figure 2 or Figure 3.

yFigure 2 is a horizontaltransverse section taken substantially on the plane of the line 2^-2'Yof Figure 1.

Figure 3 is a similar view `taken approximately on the line 3-3 of Figure 1.

Figure 4; is a detail vertical sectional view on the line 415-4 of Figure 3, and Figure 5 is y Specification of ,'Lettcrs latent.

Patented Mar. 7, 155.22. e, 1era. sei-iai no. sae/ico.

a vertical sectional view taken substantially at (right angles to the plane of Figure 1.

u aine rorni of my invention is illustrated in Lne accompanying drawings mounted upon the' top of a cylinder l of an internal combustion engine, the usual screw sockets in the top thereof being utilized, in connection with bolts 2, to secure a supporting housing 3 thereto.V This housing is substantially cylindrical and its attaching and ordinarily bottom end, is provided with slotted attaching feet il, the samereceivinof the shanks of said bolts 2. A driving electric motor 5 is secured" to one side of the housing 3 and has its axis extending in the saine direction and substantially parallel to the center line thereof'.

QSiubstantially all of the operating mechanism of the invention is normally slidably or yournally mounted within the housing 3, and since it is essential thaty the parts which are movable outwardly of 4said housing be proporly centered with respect to the bore of the cylinder' 1, provision is made for centering the housing so that its center line will coincide with that of said cylinder, Therefore after the feet have been engaged with the end of the cylinder and the bolts 2 screwed into their sockets a sufficient extent to slightly engage the feet 4t, a centering sleeve e, which is of a Vdiameter to slidably engage in the bore ofthe housing, is moved outwardly thereof to dispose it-s conical end 7 within the wall of the cylinder 1. When this engagement takes place the feet 4i will be shifted a sufiicient extent in any direction to align the housing 3 and the cylinder 1. iictuation of the sleeve is readily procured exteriorly of the housing 3 by the provision of aplurality of laterally and outwardly extending pins 8 working in slots 9 cut in said housing wall, and a collar 1()7 the pins being proyected a sufficient distance to seat 1n apertures in said collar, which slides on the outer surface of the said housing. By this arrangement the centering sleevek can be moved into or out of operative position by shifting the collar.

ln the housing 3' adjacent the centering l sleeve r7 is a main bearing 11,the same being provided with a bushing 12, the axis of the opening` of which isaligned with a bearing sleeve 13 extending' inwardly from the closed end 14 of the housing.

fin inner feed cylinder 15 is designed to rotate on the bearing sleeve 13 and has screw-threads on its outer periphery which extend throughout its length for engageincnt with similar -threads on the wall of the bore of an outer feed cylinder 1G. The threads of this cylinder extend only a portion of its length and at its upper end, said ond also having an outer feed gear 17 fixed thereto. l

lVithin'the bearing sleeve 13 adjacent its top is a bearing 13 in which is journaled a pulley 19, the .latter being disposedl eX- ternally of the closed end 14 of the casing and having' a pulley on the` armature shaft of the motor belted thereto as at 20. T he shaft section which carries the pulley 19 is connected by the universal joint 21 to one end of the female member 22 of a telescoping drive shaft 23, said member having a longitudinal slot Q4 which slidably receives a L4y Q5 on the male member Q6 of said shaft The outer end of the member 26 of the drive shaft is connected by a universal joint QT with a grinder shaft 23. the latter having a customary type of grinder wheel Q9 removably secured to the free end thereof.

This drive shaft Q3 extends longitudinallv of the cylinders and 1G. the `grinder shaft on the lower end thereof being journaled in the bearings of a swinging bearing frame 30. rl`his bearing frame is designed for transverse movement with respect to the axis of the shaft 23, it being pivoted by its ears 31 to flanges of a hinge collar 32 by means of a pintle The frame -arries a segmental worm `gear 4, the teeth of which meslrwithteeth of a worm The frame 30 and the other mechanism above set' forth are enclosed within the lower end of the outer feed cylinder, said end being closed as at 36 except for au arcuate slot receiving the grinder shaft Q8. Access to the worm is readily had through the walls of the various elements enclosing the same as indicated in Figure 2 of the drawings.

As hereinbefore mentioned the outer feed cylinder is provided with an outer feed gear 17, the same being adapted to slidably mesh with the longitudinally extending teeth of an elongated drive piston 37, the latter'being mounted on a slidable feed drive shaft 38 which is preferably polygonal in cross section throughout its length eX- cept 2111.39. which portion is cylindrical and is spaced Yfrom the end 40 of the shaft which projects through the end wall 14. portion 40. ofthe shaft 38 between said cylindrical part 39 and the adjacent end,v receives a drive pulley 41.I the same beingconnected to the armature shaft of the motor 5. similarly to the attachment between rthe armature shaft and said pulley 19. The opposite end of the feed drive shaft 38 is slidablc in a bearing carried by the main bear- That ing 1.1. Normally the elongated drive pinion 37 is partially enclosed within the housing 3 and its exposed portion is covered by a closure plate 42 whereby access may be readily had thereto.

Disposed on the. feed drive shaft 3S be! tween the upper end of the pinion 3T and the end 14 of the housing is a down feed pinion and an up feed pinion 44, the latter being larger in diameter than the forineiand meshed with an up feed gear 45 fixed to the upper end ofthe inner feed cylinder 15. The teeth of the pinion 43 are meshed with those of a down feed gear 46 also fixed to the innervfeed cylinder 15. Any suitable mea-ns may be provided for supporting the cylinder 15 against longitudinal movementV on the bearing sleeve 13. In the present structure however such longitudinal movement will be prevented by the fact that the'gear 4G overlaps the elon `gated gear 3T. Vith the parts arranged as in Figure 1, the pinion 43 is keyed t0 the drive. shaft 38, whereas the other pinion'44 is loose thereon, being located on the cylindrical portion 39 of said shaft. However, upon shifting the feed drive shaft 38 downwardly the polygonal portion thereof will be engaged with the up feed pinion 44 and the down feed pinion 43 will be loose on the shaft because ofv the cylindrical portion 39 thereof. Y

The feed drive shaft is automatically shift ed'longitudinally of its lengt-h toconnect or disconnect the pinions 43 and 44therewith by the engagement of the outer feed gear 1T with the spring finger f7 of a trip'i48, the same being'adjustably mounted upon a feed reverse rod This rod is pro-vided with a plurality of seats 50 alongfone longitudinal edge to selectively receive the end of a set screw 51 which formsV a part of the trip 4S. T his rod' 49 is located within the housing 3 and has its lower end linked as at 52 to said shaft 38. rl`he upper end of the rodA 49 isalso provided with a trip stop with which the gear gear 1T isV engage-able when moved upwardly a predetermined distance. From Figure 3 it will be noted that the head of the set screw 51 'is' positioned outwardly ofthe housing?) so that adjustment Vof the trip 48 is readily procurable exteriorlv of the latter. Y

The operation of the invention is substantially as follows: After a grinder'wheel' l29 of a proper diameter has been securedV to the end of the grinder shaft 28, the machine is mounted on the end of the cylinder, the inner wall of which is to be finished. Ordinarily a. grinder is used which is of a size to readily move inwardly of the housing 3 and through the opening in the centering sleeve 6, and is enclosed when the machine is not in operation. lVhem however, it is necessary to use a grinder of a diameter greater than the opening in said centering sleeve 6, the grinder carrying mechanism must be moved outwardly of the housing 3 to expose the outer end of the shaft 28. Vrlhe smaller grinder can thus be readily replaced by a larger one and the operation started after the various adjustments have been made.

In order to center the housing 3 with the cylinder l, the centering sleeve 6 is used as hereinbefore mentioned, the feet 4 being engaged with the end of the cylinder and the retaining bolts 2 partially screwed into their sockets in the slots of the feet, whereupon the centering collar 1() is grasped and the centering sleeve moved downwardly toward the cylinder until its conical end 7 seats directly within the bore, the wall of which is to be ground. lhile so seated the bolts 2 are tightened and the housing 3 rigidly secured to the cylinder.

The centering sleeve is then raised to its initial retracted position and the swinging bearing frame 30 adjusted by means of the worm 35, whereby the grinder 29 is shifted a required distance to remove a predetermined amount of material from the cylinder wall when rotation is started. lt will be appreciated that owing to the substantially planetary action of the grinder wheel with respect to the inner surface of the cylinder 1, only a slight shifting of the bearing frame 30 is necessary to procure a required cut.

Assuming that the necessary adjustments of the frame 30 and the trip 48 have been made and that the feed drive shaft 38 is connected with the pinion 43 and disconnected from the pinion 44, the motor 5 is started, thereby simultaneously rotating the main or telescopic drive shaft 23 and the feed drive shaft 38. Rotation of the first mentioned shaft revolves the grinder 29, whereas a rotary movement of the shaft 38 drives the elongated pinion 37 and 'the down feed pinion 43 in the same direction. Since the outer feed gear 17 and the down feed gear 46 are respectively meshed with the elongated pinion 37 and the down feed pinion 43, and as these gears are keyed to the outer feed cylinder 16 and inner feed cylinder. 15 respectively, the latter will be rotated in the same direction but Aat different speeds. That is to say the outer feed cylinder will be revolved faster than the inner feed cylinder owing to the differences in the size of the gears 17 and 46, 43 and 47 the result of this variation being that the outer feed cylinder 16 and the parts carried thereby are moved outwardly of the housing 3 and into the 'cylinder 1 very slowly. The normally high rotative speed of the motor shaft is thus stepped down to a properspeed for feeding the grinder inwardly of the cylinder, all possibility of scoring of the cylinder wall being thus eliminated.

The telescoping drive'shaft 23 permits a very extended movement of the grinder 29, which movement carries the same inwardly of the cylinder until the outer feed gear 17 comes into contact with the spring-finger 47 of the trip 48. As hereinbefore mentioned contact between these parts shifts the feed drive shaft 38 downwardly and successively disconnects the pinion 43 therefrom and connects the pinion 44 thereto. The slight free movement of the spring finger 47 is adapted to permit the end 40 of the shaft 38 to properly seat within the polygonal aperture in the pinion 44. The result of these changes is to cause the inner feed cylinder 15 to rotate at a greater Vspeed than the outer feed cylinder 16, and. since these cylinders are revolving in the samel direction, the intermeshing threads thereon will cause the outer cylinder to move inwardly of the casing at a relatively slow speed. The grinder 29 is also retracted at the same time, but while still revolving as before. The feed is again reversed and caused to operate as first set forth by the engagement of the outer feed gear 17 with the trip stop 53, such engagement causing the return of the feed drive shaft 38 to the position indicated in Figure l. After a sufficient amount of material has been removed from lthe cylinder wall, the machine is readily taken from the cylinder by loosening and removing the bolts 2 as is obvious.

From the foregoing description taken in connection with the accompanying drawing, it will be appreciated that): have invented a very simple machine for boring or refinishing cylinder walls, the actions of which during the actual grinding operations, are entirely automatic. With such machine eXtreme accuracy is readily procurable in addition to quickness and thoroughness of operation. Various changes 110 and modifications may be made in the several parts of the machine without departing from or sacrificing any of the principles or advantages as set forth above and claimed in the following claims.

I claim:

1. A machine of the class described comprising a pair of rotatable threadedly engaged. elements, one being held against movement longitudinally of its axis, the 12o other being loosely mounted, a rotary member carried by the loosely mounted element, means for rotating the member, and means for rotating the elements'in the same direction at different speeds to procure a rela- 125 tively slow longitudinal movement of the loosely mounted element.

2. A machine of the class described comprising a pair of rotatable threadedly engaged elements, one being held against move- 130 ment longitudinally of its aXis, the other being loosely mounted, a rotary memberecarried by the loosely mounted element, means for rota-ting the member, a feed drive shaft, a driving connection. between the shaft and one of the elements, and a selective speed transmission mechanism between the shaft and the other element.

n. machine of the class described comprising` a pair of rotatable threadedly engaged elements, one l being held against movement longitudinally of its axis, the other being' loosely mounted, a rotary member carried by the loosely mounted element, means for rotating the membena feed drive shaft, a driving connection between the shaft and one of the elements, a pair ofV gears of diffe-rent sizes fixed to the other element, a pair of pinions on the shaft and meshed with the respective gears, and means for connecting either of the pinions to the shaft for rotation therewith.

4. A machine of the class described comirising a pair of rotatable threadedly engaged elements, one being' held against movement longitudinally of its axis, the other being' loosely mounted, a rotary member carried by the loosely mounted element, means for rotating the member, a feed drive shaft, a drivingl connection between the shaft and one of the elements, a pair of gears .of different sizes fixed to therother element, a pair of pinions on the shaft and meshed with the respective gears, and means operable by the movement of said loosely mounted element to connect either of said pinions to the shaft.

- 5. A machinerof the class described comprising` a pair of rotatable threadedly en respective gears, and means operable by a y member on the'loosely mounted element for shifting the shaft to key either of, said pinions thereto.

6. A machine of the class described comprising` an eXteriorly threaded element rotatablyniountcd but held against lon itud` inal movement, a loosely mounted element threaded 'onto the said first named element` an independently rotatable member carried by said loosely mounted element, and means for rotating said elements at different speeds to procure a relatively slow longitudinal movement of the loosely mounted element.

In testimony that I claim the foregoinghave hereunto set my hand at lvlilwaukee, in the county of'Milwaukee and State of lisconsin.

JOHN L.V Gamme. y' 

